EN1092-1 Slip-On Flanges (Type 01) are standardized steel pipe flanges, designed and manufactured in strict accordance with EN1092-1 European standard for wrought steel flanges and their joints. As a widely applied connection component in industrial piping systems, they are recognized for their cost-effectiveness, simplified installation process, and reliable sealing performance. Thus they are preferred choice for medium and low-pressure industrial applications across global markets.

Design Features of Type 01 Slip-On Flanges

The design specification of EN1092-1 Slip-On Flanges Type 01 is defined by the European Committee for Standardization (CEN), ensuring uniform dimensional tolerances, material requirements, and performance benchmarks.

Unlike weld neck flanges, Type 01 slip-on flanges feature a straightforward structure: the flange is slipped over the outer surface of the connecting pipe, then secured with fillet welds on both the inner and outer circumferences of the flange hub. This design reduces installation complexity, shortens construction time, and lowers welding requirements. Besides, it maintains sufficient structural integrity for standard industrial operating conditions.

Sealing Surface Options for EN1092-1 Flanges

The sealing surface of EN1092-1 Slip-On Flanges Type 01 follows EN1092-1 standard specifications, typically adopting a type A-flat face (FF) or type-B raised face (RF) design.

Type A: The flat face (FF) is suitable for low-pressure (PN≤10) and non-toxic media pipelines, ensuring simple sealing with standard gaskets.

Type B: The raised face (RF) is designed for medium-pressure (PN10-PN16) systems, providing enhanced sealing performance by increasing the contact pressure between the flange and gasket.

Both designs are compatible with EN-standard gaskets (non-asbestos, PTFE, graphite), effectively preventing media leakage and ensuring compliance with industrial safety requirements.

EN Approved Material for Flanges Type 01

Materials for EN1092-1 Slip-On Flanges comply with European material standards and EN1092-1 specification requirements, with carbon steel as the primary option for general industrial use. The core European material grades include EN 10025 S235JR, S275JR (carbon structural steel), EN 10213 C22.8 (carbon steel for pressure equipment), and EN 10222-2 P235GH, P265GH (pressure vessel carbon steel). For corrosive media environments (such as petrochemical and marine pipelines), stainless steel grades EN 1.4301 (304 equivalent), EN 1.4401 (316 equivalent) are available. Alloy steel grades (e.g., EN 1.7182) are optional for high-temperature, medium-pressure industrial systems, ensuring full compatibility with EN1092-1 standard requirements.

PN16 EN1092-1 Type 01 Slip-On Flanges Dimension

Quality Control for EN1092-1 Flange

Quality control of EN1092-1 Flanges is implemented throughout the manufacturing process, in strict accordance with EN1092-1 and relevant European industrial standards. All flanges undergo strict dimensional verification to ensure consistency with EN1092-1 standard tolerances; material composition analysis is conducted to confirm compliance with specified European steel grades; and pressure testing (hydrostatic testing or pneumatic testing) is performed to verify sealing performance and pressure-bearing capacity.

Additionally, surface treatment (such as hot-dip galvanizing, anti-rust painting, or pickling and passivation) is available to enhance corrosion resistance and extend the service life of the flanges.

Where to Use Type 01 Slip-On Flange?

EN1092-1 Type 01 Slip-On Flanges are widely applied in industrial sectors that adopt European standards, including oil and gas transmission, petrochemical processing, power generation (thermal power, hydropower), water treatment, chemical engineering, and general manufacturing. Their adaptability to medium and low-pressure systems, combined with cost-effectiveness and easy installation, makes them an indispensable component in modern European-standard industrial piping networks.

Summary

EN1092-1 Slip-On Flanges Type 01 adhere to EN1092-1 European standards, featuring standardized design, compliant European material grades, reliable performance, and wide application scope. Whether for standard specifications or custom requirements, these flanges provide a practical and economical piping connection solution, fully meeting the high standards of global industrial customers who adopt European piping systems.

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We welcome inquiries from project developers, contractors and enterprise clients to whom we will offer professional technical support and efficient manufacturing services. 

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Forged industrial flange dimensions cover steel material, size, seal face, pressure rating, schedule, standard and flange types.

Flange is one of the most common parts in engineering design. It is a piping design, pipe valve essential parts, but also necessary components for equipment and equipment components (such as manhole, mirror liquid level meter, etc.). In addition, other professions also often use flange joints,such as industrial furnaces, thermal technical, water supply and drainage, heating and ventilation, self-control, etc.

Forged Steel Flange Material

Forged Steel, WCB Carbon Steel, Stainless Steel, 316L, 316, 304L, 304, 321, CR-MO Steel, CR-mo Vanadium Steel, Molybdenum Titanium, Liner, Fluorine-lined Material.

Standard of Pipe Flange

GB, JB, HG, ASME B16.5, BS4504, DIN, JIS

Flange Type

PL Flange,Slip On Flange,Weld Neck Flange, Lap  Joint Flange,Socket Weld Flange,Blind Flange and so on.

PL Flange Dimensions

PL Flange

Advantages:Convenient, manufacture simple, low cost, widely use

Shortcomings: Poor rigidity is poor, not suitable for the chemical process piping system, extremely hazardous occasions which have supply and demand, flammable, explosive and higher vacuum requirements

The sealing type: Flat Face and Raised Face

Slip On Flange Specification

Slip On Flange

Advantages:Easy to install on site and omit the process of rubbing the weld

Shortcomings: The height of Slip On Flange neck is lower, the stiffness and bearing capacity of the flange are higher. Compared with the Weld Neck Flange, the welding workload is large and electrode consumption is high, also can not withstand high temperature,high pressure,repeated bending and temperature fluctuation.

Weld Neck Flange Dimensions

Weld Neck Flange

The sealing type: RF,FM,M,T,G,FF

Advantages:The connection is not easy to deform, seal is good and application is widespread. It is applies in the temperature or the pressure large fluctuation pipeline or the high temperature, the high pressure and the low temperature pipeline, also uses in the transporting expensive medium, flammable explosive medium and poisonous gas pipeline

Shortcomings:Large size, heavy weight, expensive, installation positioning is very difficult. Also easy to bump in transit.

Integral Flange Specification

Integral Flange

The Integral Flange is a flange connect method. Also belongs to weld neck flange. Material has carbon steel, stainless steel, alloy steel and so on. In China standards,”IF” means Integral Flange.

Mostly used in higher pressure pipeline. The manufacture process is generally cast.

In the flange type, an “IF” is the type of integral flange.

Generally it is raised face (RF), if in the flammable, explosive, high and extreme hazards of working conditions, you can choose MFM and TG sealing type.

Socket Weld  Flange Dimensions

SW Flange drawing

Socket Weld Flange

Socket Weld Flange is one end weld on pipe and the other connect by bolts.

The sealing type: RF,MFM,TG,RJ

Application: Boiler Pressure Vessels, Petroleum, Chemical, Shipbuilding, Pharmaceutical, Metallurgy, Machinery, Stamping Elbow Food and other industries.

Used in the pipeline which PN≤10.0MPa，DN≤40

Threaded Flange Specification

Drawing of Thread Flange

Thread Flange

The thread flange is a kind of non welded flange which is machined flange inner hole into thread, and connected with the thread end.of pipe.

Advantages:Compared with Slip On Flange and Weld Neck Flange, the thread flange has the features of easy installation, maintenance, can be used on some sites that not allow welding pipeline. Alloy Steel Flange has enough strength, but difficult to weld, or welding performance is not good,also can choose thread flange.

Shortcomings:Under the condition that pipeline temperature is changed sharply or higher than 260 ℃ and below-45 ℃, to avoid leakage, the threaded flange is not recommended.

Butt Weld Ring Loose Flange Dimensions

Butt Weld Ring Loose Flange

The Butt Weld Ring Loose Flange is movable.Generally supporting in the water supply and drainage fittings, each end of the expansion joint has a flange while sending. Connecting the pipe and equipment by bolts directly in the project.

The purpose of using is to save the material. it is divided into two parts, the pipe part is connected with the pipe, and the other end is made into butt weld ring. The ring flange is made by low grade material, but the pipe part uses the same material as the pipeline.

Advantages

Cost savings. When the material of pipe is special and expensive, the same material of flange is costly.

Not easy to weld or inconvenient to process or require a large strength. such as plastic pipes, glass pipes and so on.

Convenient for construction. While in connection, the flange bolt hole corresponding is not easy to find positive or prevent future replacement equipment, flange bolt hole has changed.

Shortcomings

Withstand low pressure

Low strength at weld ring (especially when thickness is below 3mm)

Flat Weld Ring Loose Flange Specification

PJPR Flange

Flat Weld Ring Loose Flange is movable. Connect with the pipeline and equipment by bolts directly in the project.

The purpose of using is to save cost, it is divided into two parts, the pipe part is connected with the pipe, and the other end is made into stub, and the flange plate is set on the stub.

The flange plate uses the low grade material, but the pipe part uses the same material as the pipeline, achieves the saving purpuse.

Advantages:

Cost savings. When the material of pipe is special and expensive, the same material of flange is costly.

Not easy to weld or inconvenient to process or require a large strength. such as plastic pipes, glass pipes and so on.

Convenient for construction. While in connection, the flange bolt hole corresponding is not easy to find positive or prevent future replacement equipment, flange bolt hole has changed.

Shortcomings

Withstand low pressure

Low strength at weld ring (especially when thickness is below 3mm)

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• Water Cooling System – Tank Diameter = 22.28 M and 25.46 M
• Foam Fire Fighting System – Tank Diameter = 22.28 M and 25.46 M

According to the drawing, we cut pipes into various length. And then welded A105 Blind Flange and S.O Flange on the pipe.

We conducted hydro test, 10% dye penetrant test and Magnetic particle test. After testing, we can guarantee that the connection and welding are in good quality.

After the test above, all materials will be hot dip galvanized.

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